The prime factors of 20 are 2x2x5.
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All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
The numbers 11, 13, 17 and 19 are prime.
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The prime numbers from 1 - 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
2,3,5,7,11,13,17,19